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That might be the SdFinishReboot dialog box, which you can add to your script. (As a tip, you can use the Dialogs view and also the Dialog Sampler under the Tools menu to see previews of the different built-in dialog boxes.)

If this is an InstallScript or InstallScript MSI project, the OnFirstUIAfter and OnMaintUIAfter contain the dialog boxes to be displayed at the end of your installation. To modify the sequence of dialog boxes, you can modify the dialog functions called in those event handlers.